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Abstract
The production of Portland cement (OP) is commonly associated to significant level of energy consumption and gas emissions. The use of calcium sulfoaluminate cement (CSA) can be a sustainable alternative binder, since its production releases about half of the CO2 emissions and its clinker requires 200 °C lower temperatures, when compared to OP. Furthermore, CSA has fast setting time and achieves higher strength in shorter periods, as well as reduced shrinkage. This paper discusses the incorporation of CSA in rendering mortars and basecoat mortars for ETICS (External Thermal Insulation Composite Systems). The physical-mechanical properties of mortars made with OP and CSA cements were experimental evaluated. The results showed that the introduction of CSA generally improves shrinkage, compressive strength, water absorption at low pressure, enhances the tensile bending strength and decreases the setting time. The amount of CSA introduced into the mixture significantly affected the properties of the cement matrix.
Highlights
Portland cement, developed approximately 175 years ago, has been largely used in construction, as primary binder in concrete production
The present study aims at the characterization and evaluation of mortars with Portland and calcium sulfoaluminate (CSA) binders
It can be noticed that the inclusion of CSA cement provides a plastic effect in the mortars at the fresh state, significantly decreasing the setting times and the flow value
Summary
Portland cement, developed approximately 175 years ago, has been largely used in construction, as primary binder in concrete production. This material is among the most used building material due to its durability, versatility and economic feasibility [1]. Around 5% of CO2 gas emissions (i.e., 2 billion tons/year) are related to the cement industry [2]. The production of this binder consumes between 10–11 EJ per year, approximately 2 to 3% of the primary energy consumption [1,3] For this reason, an increasing pressure has been put on the cement industry, with the aim of reducing the energy usage and, gas emissions
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